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Earthquakes and Structures Volume 11, Number 2, August 2016 , pages 347-369 DOI: https://doi.org/10.12989/eas.2016.11.2.347 |
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Robust multi-objective optimization of STMD device to mitigate buildings vibrations |
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Saeid Pourzeynali, Shide Salimi, Meysam Yousefisefat and Houshyar Eimani Kalesar
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| Abstract | ||
| The main objective of this paper is the robust multi-objective optimization design of semi-active tuned mass damper (STMD) system using genetic algorithms and fuzzy logic. For optimal design of this system, it is required that the uncertainties which may exist in the system be taken into account. This consideration is performed through the robust design optimization (RDO) procedure. To evaluate the optimal values of the design parameters, three non-commensurable objective functions namely: normalized values of the maximum displacement, velocity, and acceleration of each story level are considered to minimize simultaneously. For this purpose, a fast and elitist non-dominated sorting genetic algorithm (NSGA-II) approach is used to find a set of Pareto-optimal solutions. The torsional effects due to irregularities of the building and/or unsymmetrical placements of the dampers are taken into account through the 3-D modeling of the building. Finally, the comparison of the results shows that the probabilistic robust STMD system is capable of providing a reduction of about 52%, 42.5%, and 37.24% on the maximum displacement, velocity, and acceleration of the building top story, respectively. | ||
| Key Words | ||
| semi-active control system; multi-objective optimization; robust design; genetic algorithm; fuzzy logic controller; earthquake excitation | ||
| Address | ||
| Saeid Pourzeynali, Meysam Yousefisefat: Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, I. R. Iran Shide Salimi, Houshyar Eimani Kalesar: Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh-Ardebili, Ardebil, I. R. Iran | ||